Visionless ventilator



Feb. 12, 1929. 1,701,993

c. M. WILLS' VISIONLESS VENTILAIOR Filed March 31, 1928 awumdoz IHBShlllg'Wlth a pinion, and means exterior of the olevice'whereby the shutters may be revolved into abutment and -non-ahut1nent position with opposite Wings.

3. In a visionless ventilator, in combination, a casing having a top, a' bottom, two I ends and tWo sides, each side having ar'pln-i rality of vertical openings, the openings with opposite wings. V

in the two sides being in opposite alignment with each other; a Wing. extending inwardly from each side margin of each opening; a plurality of pivotal shutters positioned in abutment with said openings capable of abutment with. opposite Wings, a pinion carried by each shuttei a lOCl extending longitudinally of the device; a pluralltylof racks carried by said i ocl, each rack mesh ;ing with a pinion andineansc'extei ior of the devlcewlnch.the shutter may be revolved oppositely with respect to each other and into abutment and non-abutment pos t on 4. Ina vlsionless ventilator, in combinat1on,a caslng hav ng a top, a bottom, two

wings.

ends and two sides, each side having a pluabutment; with opposite Wings, a pinion Caii'ie dby eaclishutter; EL'lOCl extending longitudinally of the device; a plurality of,

racks cai'i'iecl'by said rod,each rack rneshing with a pinion, a pivoted arm movably attached tovsaid rod and extending outwardly ofthe device, the movement of said arm causing the shutters torevolvein op posite directions with respect to each other and causing said shutters to move fromnon-ebutinent to abutment with opposite Signed at" Philadelphia "in the connty of Philadelphia and State :of Pennsylvania, this 29 day of March, 1928.

CHARLES M. WILLs. 

